One good thread hijack deserves another, I always say...
vfrcapn, Sep 23 2007, 04:59 PMBTW, the only offical Honda release I've seen lists rake and trail as 25.5deg, 95mm for the 5G. http://world.honda.com/news/1998/printerfr...ly/2980410.html
Many publications like Sportrider, Motorcyclist, etc report trail as 100mm. http://www.sportrider.com/bikes/146_9806_h...r800/index.html I suppose different tire sizes could be the variable. (IMG:style_emoticons/oldemoticons/unsure.gif)
STOP!
I've just gone through a shed-load of info online (some of it originated here) and in Honda Workshop Manuals, and I can say categorically that if you make a serious decision based on what's written in a Honda Press release or (worse, still) a magazine article, you are playing with fire. I've seen articles make howling mistakes about basic things, much less technical specs, and I've seen Honda press materials contradict each other between the "Features" and "Specifications" pages... Short of actually measuring your own bike, the best way of figuring out which specs are accurate is to consult the General Information section of an official Honda Workshop Manual. (I've seen these to be wrong, too, but they are still the best sources available.)
The main problem with even reliable, official specs is that not everything is listed. For example, fork offset is never mentioned--it must be physically measured, and it's not an easy spec to determine. I'm thinking the best way may be to take the upper triple clamp off the bike, flip it over and plot its holes directly onto a sheet of paper, then find the centers and measure the offset on the paper. (Any better ideas?) You will also never find fork spacing or wheel hub width listed in any spec sheet, so the only option is to physically measure the parts in question.
With respect to the Frankenviffer game (veering back on topic...), I have long heard that such and such is the same as that part, and this other part from a different bike. Well, I'm beginning to doubt some of this conventional wisdom. Latest was the discussion regarding four-piston brake caliper interchangeability. Yes, many Honda calipers will fit different bikes, but they are by no means identical (the thread was "saved" by vfrcpn, I think), as most have different piston diameters and are therefore designed to work with different-sized master cylinders--ignore this and you will have a mismatch; get it really wrong and you will have no brakes!
The usual USD-equipped Honda sport bikes (600RR/929/954/SP1/SP2/1000RR) all have different rake and trail numbers (even using Honda Workshop Manual specs), so is it actually reasonable to consider their parts totally interchangeable? I'm no longer willing to accept that if they can be bolted together, they're the same. True, the official specs can all be made different by something as simple as raising or lowering the forks in the yokes (or changing the rear suspension specs, for that matter), but I still want to make sure. All I bloody want is the same geometry after as before any swap, and I'm tired of people claiming it doesn't matter! (IMG:style_emoticons/oldemoticons/mad.gif) So...
I'm going to get to the bottom of the suspension specs game and I've begun to put together a spreadsheet listing precise model information, suspension dimensions and brake specs. Right now it's more holes than cheese (because I have had to make most of the info "unconfirmed"), but I hope to have something useful to upload in the next couple of weeks. I've got many Honda manuals in electronic and paper form, though there are some gaps in my collection, so I'll be asking people with access to Honda Workshop Manuals for other bikes to confirm some of the stats for me. Basically, I'm including info for all Honda sport (and sport-ish) bikes from the CBR600F2 through the present generations of CBR, RVF, VFR and VTR. That's right, I only do Hondas. Sorry! (Someone else can add the R1/mongrel stuff later?)
Ciao,